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Integrating Charge / IEPE Amplifiers

Integrating Charge / IEPE Amplifiers

Integrating Charge / IEPE Amplifiers

Product catalog summary
Overview
This document provides technical specifications and application details for the M68D1, M68D3, and M68R1 integrating charge/IEPE amplifiers used for signal conditioning in dynamic measurements with piezoelectric sensors.

Applications
  • Signal conditioning for dynamic measurements with piezoelectric sensors for acceleration, force, and pressure, or microphones.
  • Front-end with anti-aliasing filter for PC data acquisition systems.
  • Multichannel measuring systems.

Key Features
  • M68D1 and M68D3 are bench-top instruments, while M68R1 is designed for 19-inch rack systems.
  • M68D3 includes three amplifier channels.
  • Inputs for charge mode transducers and transducers with constant current supply (IEPE).
  • Five charge ranges and four IEPE ranges.
  • Output options include no integration, single, or double integration.
  • Selectable low-pass filter with frequencies ranging from 0.1 to 50 kHz.
  • High-pass filter options at 0.1 and 3 Hz.
  • LED indicators for minimum level and overload.
  • Low noise and easy adjustment via rotary switches.
  • Powered by external DC voltage (5 to 15 V) or mains; M68D1 can also use internal batteries.
  • Bench-top cases available for 6 or 12 M68R1 modules.

Technical Specifications
  • Amplifier channels: M68D1 and M68R1 have one channel, M68D3 has three.
  • Inputs: Charge and IEPE input, single-ended, BNC socket.
  • IEPE sensor supply: 3.8 to 5.6 mA constant current, 24 V compliance voltage.
  • Gain: Adjustable from 0.1 to 1000 mV/pC or mV/mV.
  • Accuracy: ±1% typical, ±2% maximum.
  • Measuring range: Charge from 1 pC to 100,000 pC; voltage from 1 mV to 10 V.
  • Low-pass filter: 0.1 to 50 kHz, -40 dB/decade attenuation.
  • High-pass filter: 3 Hz or full bandwidth from 0.1 Hz.
  • Integrator frequency range: 3 to 1000 Hz (first integrator), 3 to 100 Hz (second integrator).
  • Crosstalk attenuation: >60 dB.
  • Output noise: <15 mVrms with charge input, <10 mVrms with IEPE input.
  • Output: ±10 VPP, DC coupled, offset error <10 mV.
  • External power supply: 5 to 15 V DC.
  • Battery operation (M68D1 only): 4 x AA batteries, >10 hours with alkaline cells.
  • Operating temperature: -10 to 55 °C, 95% relative humidity.

Accessories
  • Supplied: Mains plug adapter (100 to 240 VAC).
  • Optional: Charge attenuators MQ20 (1:10) and MQ40 (1:100), 19" cases for M68R1 modules.
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Catalog excerpts

Integrating Charge / IEPE Amplifiers-1

Integrierende Ladungs-/IEPE-Verstärker Integrating Charge / IEPE Amplifiers Messverstärker Signal Conditioners • Signalaufbereitung bei dynamischen Messungen mit piezoelektrischen Sensoren für Beschleunigung, Kraft und Druck oder mit Mikrofonen • Signalanpassung und Antialiasing-Filterung bei Messung mit PCDatenerfassungssystemen • Aufbau von Vielkanal-Messsystemen • Signal conditioning for dynamic measurement with piezoelectric sensors for acceleration, force and pressure or microphones • Front-end with anti-aliasing filter for PC data acquisition systems • Multichannel measuring systems • M68D1 und M68D3 als Tischgeräte, M68R1 als Einschub für 19-Zoll-Racksysteme • M68D3 mit 3 Verstärkerkanälen • Eingänge für Ladungsaufnehmer und Aufnehmer mit Konstantstromspeisung (IEPE) • 5 Ladungsbereiche, 4 IEPE−Bereiche • Ausgang wahlweise ohne Integration, mit einfacher oder doppelter Integration • Variables Tiefpassfilter mit 0,1 / 0,3 / 1 / 10 / 20 / 50 kHz • Hochpassfilter mit 0,1 und 3 Hz • LEDs für Minimalpegel (> 5 %) und Übersteuerung • Einfache Einstellung mit Drehschaltern • Geringes Rauschen • Betrieb mit externer Gleichspannung 5 .. 15 V oder Netzteil • Typ M68D1 kann auch mit internen Batterien versorgt werden • Tischgehäuse für 6 oder 12 M68R1-Module lieferbar • M68D1 and M68D3 are bench top instruments, the M68R1 is suited for 19 inch rack mounting • Model M68D3 has 3 amplifier channels • Inputs for both charge mode transducers and transducers with constant current supply (IEPE) • 5 charge ranges, 4 IEPE ranges • Output either without integration or with single or double integration • Selectable low-pass filter with 0.1 / 0.3 / 1 / 10 / 20 / 50 kHz • High-pass filter with 0.1 and 3 Hz • Minimum level (> 5 %) and overload LED indicators • Easy adjustment by rotary switches • Low noise • Powered by external DC voltage source from 5 to 15 V or mains • Model M68D1 can be powered also by internal batteries • Bench top cases for 6 or 12 M68R1 modules available

 Open the catalog to page 1
Integrating Charge / IEPE Amplifiers-2

Technische Daten Technical Data M68D1 Anzahl der Verstärkerkanäle Number of amplifier channels Eingänge Inputs IEPE-Sensorspeisung IEPE sensor supply Verstärkung Gain Genauigkeit Accuracy Messbereich für angegebene Genauigkeit Measuring range for stated accuracy Tiefpassfilter Lowpass filter Hochpassfilter Highpass filter Frequenzbereich der Integratoren Frequency range of integrators Übersprechdämpfung Crosstalk attenuation Ausgangsrauschen mit Ladungseingang Output noise with charge input Ladungseingang und IEPE-Eingang, massebezogen, BNC-Buchse Charge input and IEPE input, single ended, BNC...

 Open the catalog to page 2

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